9

®

3650/52

The effects of temperature may be analyzed by replacing the

offset terms with their corresponding temperature gradient

terms:

For a complete analysis of the effects of temperature, gain

variations must also be considered.

OUTPUT NOISE

The total output noise is given by:

noise currents of the output stage. Errors created by the noise

current of the input stage are insignificant compared to other

noise sources and are therefore omitted.

FIGURE 6c. 3652 with Differential Voltage Sources.

FIGURE 7. DC Error Analysis Model for 3650.

I

A

1

–

R

G2

+

+

–

R

G1

I

B1

I

B2

E

OSI

C (Input)

A

2

–

+

1M

Ω

E

OSO

I

3

λ

I

4

C (Output)

Optics

I

1

I

2

2R

G1

OSI

+

C

R

G1

R

G2

R

IN

V

ISO

V

1

11

10

12

17

(1)

V

OUT

–

23

+

–

C

NOTE: (1) The offset adjustment circutry and power supply connections

have been omitted for simplicity. Refer to Figure 5 for details.

Ω

R

V

V

ISO

IMRR

A

1

A

2

R

O

2

R

O

2

6

4

3

1

8

9

V

2

–I

R

+I

R

+I

–I

+0

–0

R

total output error voltage due to offset voltages and bias

currents.

Offset current is defined as the difference between the two

This component of error is not a function of gain and is

output errors due to the output stage bias current are also

the total error:

(2)

In summary, it should be noted that equation (2) should be

applies.

2

OS